Originally Posted by stratslinger
I think the typical range is somewhere between 1 and 1.5qts, so you can go at least a bit beyond 1.25 without any trouble. I couldn't really tell you where the effective limit is, though I believe Yooper suggested earlier in this thread that as much as 2 gallons per pound would work also - not sure if that'd start to eat into your efficiency at that point though, which I guess goes to your question.
Traditionally, mashing uses 1.25- 2 quarts of water per pound of grain. But there are some BIABers who use a much higher ratio. I never have, but I have used 2 quarts of water per pound when I had a smaller mash.
I remember someone (John Palmer?) saying that in general you want to use no more than about 3 quarts of water per pound of grain total, including the sparge. I've kept that in the back of my mind for years- but of course the BIAB folks have successfully been doing that or thinner.
Still, for traditional mini-mashes, I'd keep the 2 quarts of water per pound of grain as a max until I had more experience with thinner mashes.